Challenge: A Catholic Scotland

How can we get a Kingdom of Scotland that remains Catholic throughout the sixteenth century, and manages to suppress any significant reformist movement? Also, what implications and effects would this have?

The only requirements are: the POD must take place after the Battle of Flodden Field, which should be easy enough; and, the English Reformation must still take place under Henry VIII as in OTL.

EDIT: Sorry, this was obviously meant to be in the Pre-1900 forum--please move it accordingly.
 
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